diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..11657e3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+db
+.php-*
+REPORT_CONTENTS
diff --git a/database.php b/database.php
new file mode 100644
index 0000000..2aad542
--- /dev/null
+++ b/database.php
@@ -0,0 +1,214 @@
+<?php
+
+include_once 'utils.php';
+
+$RESULT_MODE = SQLITE3_BOTH;
+
+session_start();
+
+function connectToRedis()
+{
+    $redis_host = '127.0.0.1';
+    $redis_port = 6379;
+
+    try {
+        $redis = new Redis();
+        if ($redis->connect($redis_host, $redis_port)) {
+            /* if ($redis_password) { */
+            /*     $redis->auth($redis_password); */
+            /* } */
+            return $redis;
+        }
+        return false;
+    } catch (Exception $e) {
+        error_log("Redis connection error: ".$e->getMessage());
+        return false;
+    }
+}
+
+function initializeNewUser()
+{
+    $redis = connectToRedis();
+    if (!$redis) {
+        return false;
+    }
+
+    $user_id = generateUUID();
+
+    $redis->hSet('users', $user_id, json_encode([
+        'created_at' => time(),
+        'status' => 'active'
+    ]));
+
+    $db_file = "db/$user_id.db";
+    $db = new SQLite3($db_file);
+
+    $schema_sql = file_get_contents('db/schema.sql');
+    if (!$schema_sql) {
+        error_log("Failed to read schema file: $schema_path");
+        return false;
+    }
+
+    $db->exec($schema_sql);
+
+    if (!$db) {
+        // Cleanup Redis entry if db creation fails
+        $redis->hDel('users', $user_id);
+        return false;
+    }
+    $db->close();
+
+    return ["user_id" => $user_id, "db_file" => "db/$user_id.db"];
+}
+
+function initializeApp($existing_user_id = null)
+{
+    if ($existing_user_id) {
+        /* $_SESSION["user_id"] = $existing_user_id; */
+    } else {
+        return initializeNewUser();
+    }
+}
+
+function getDB($user_id = null)
+{
+    if (!is_null($user_id)) {
+        $db_file = "db/$user_id.db";
+        if (!file_exists($db_file)) {
+            return createUserDatabase($user_id);
+        }
+        return new SQLite3($db_file);
+    }
+}
+
+function registerUser($username, $email, $password)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "INSERT INTO users(username, email, password) values ('$username', '$email', '$password');";
+
+    return $db->exec($query);
+}
+
+function loginUser($email, $password)
+{
+    global $RESULT_MODE;
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT username, password FROM users WHERE email = '$email';";
+    $result = $db->query($query)->fetchArray($RESULT_MODE);
+    if ($result["password"] === $password) {
+        return $result['username'];
+    } else {
+        return null;
+    }
+}
+
+function getUserById($id)
+{
+    global $RESULT_MODE;
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT username, email FROM users WHERE id = $id";
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function createProduct($title, $amountInStock)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "INSERT INTO products(title, amount_in_stock) values ('$title', $amountInStock)";
+
+    try {
+        return $db->exec($query);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getProductsByTitle($title)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM products WHERE title like '".$title."%'";
+
+    error_log($query, 0);
+    try {
+        $result = $db->query($query);
+        if ($result === false) {
+            error_log("{$db->lastErrorCode()}", 0);
+            throw new Exception($db->lastErrorMsg());
+        }
+
+        $products = [];
+        while ($row = $result->fetchArray($RESULT_MODE)) {
+            $products[] = $row;
+        }
+        return $products;
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getAllProducts()
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM products";
+
+    try {
+        $result = $db->query($query);
+        $products = [];
+        while ($row = $result->fetchArray($RESULT_MODE)) {
+            $products[] = $row;
+        }
+        return $products;
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function deleteProductByTitle($title)
+{
+    $db = getDB($_COOKIE['user_id']);
+    $query = "DELETE FROM products where title='$title'";
+
+    try {
+        return $db->exec($query);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getOrdersForUser($userId)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM orders WHERE user_id = $userId";
+
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
+
+function getOrdersForProduct($productId)
+{
+    global $RESULT_MODE;
+
+    $db = getDB($_COOKIE['user_id']);
+    $query = "SELECT * FROM orders WHERE product_id = $productId";
+
+    try {
+        $result = $db->query($query);
+        return $result->fetchArray($RESULT_MODE);
+    } catch (Exception $e) {
+        $_SESSION['error_message'] = $e->getMessage()."\n";
+    }
+}
diff --git a/header.php b/header.php
new file mode 100644
index 0000000..82a1e71
--- /dev/null
+++ b/header.php
@@ -0,0 +1,40 @@
+<header>
+    <nav class="nav-links">
+        <a href="/users">Users</a>
+        <a href="/products">Products</a>
+        <a href="/orders">Orders</a>
+    </nav>
+
+    <div class="auth-section">
+        <?php
+        session_start(); if(isset($_SESSION['username']) && !empty($_SESSION['username'])): ?>
+        <div class="user-info">
+            <span class="username">Welcome, <?=htmlspecialchars($_SESSION['username'])?></span>
+            <a href="/logout" class="logout-link">Log out</a>
+        </div>
+        <?php else: ?>
+        <?php if (isset($_SESSION['error_message'])): ?>
+            <p style="color: red; text-align: center;"><?= $_SESSION['error_message'] ?></p>
+        <?php endif; ?>
+        <form id="authenticate-form" action="/login" method="post">
+            <input type="text" name="username" placeholder="Username (*for registration*)">
+            <input type="text" name="email" placeholder="Email" required>
+            <input type="password" name="password" placeholder="Password" required>
+            <button type="button" onclick="submitForm('login');">Login</button>
+            <button type="button" class="register-btn" onclick="submitForm('register');">Register</button>
+        </form>
+        <script>
+        function submitForm(action) {
+            const form = document.getElementById('authenticate-form');
+
+            form.action = `/${action}`;
+            if (form.checkValidity()) {
+                form.submit();
+            } else {
+                form.reportValidity();
+            }
+        }
+        </script>
+        <?php endif; ?>
+    </div>
+</header>
diff --git a/index.css b/index.css
new file mode 100644
index 0000000..7797863
--- /dev/null
+++ b/index.css
@@ -0,0 +1,122 @@
+body { 
+    font-family: Arial, sans-serif; 
+    max-width: 1200px;
+    margin: 0 auto;
+    padding: 10px;
+}
+.product { 
+    background: #f5f5f5; 
+    padding: 15px;
+    margin-bottom: 10px;
+    border-radius: 5px;
+}
+label { 
+    display: block;
+    margin-bottom: 5px;
+}
+input, textarea, select { 
+    width: 100%;
+    padding: 8px;
+    margin-bottom: 10px;
+    max-width: 400px;
+}
+button {
+    padding: 0.5rem 1rem;
+    background: #4CAF50;
+    color: white;
+    border: none;
+    cursor: pointer;
+    font-weight: bold;
+    border-radius: 3px;
+    text-decoration: none;
+    display: inline-block;
+}
+button:hover {
+    background-color: #45a049;
+}
+.delete { 
+    background: #f44336;
+}
+.search { 
+    background: #2196F3;
+}
+.warning { 
+    color: #f44336;
+    font-weight: bold;
+}
+
+header {
+    background-color: #333;
+    color: white;
+    padding: 1rem;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+
+.nav-links {
+    display: flex;
+    gap: 1.5rem;
+}
+
+.nav-links a {
+    color: white;
+    text-decoration: none;
+    font-weight: bold;
+}
+
+.nav-links a:hover {
+    text-decoration: underline;
+}
+
+.auth-section {
+    display: flex;
+    align-items: start;
+    gap: 0.75rem;
+}
+
+#authenticate-form {
+    display: flex;
+    gap: 0.5rem;
+    align-items: start;
+}
+
+#authenticate-form input {
+    padding: 0.5rem;
+    border: none;
+    border-radius: 3px;
+}
+
+.register-btn {
+    background-color: #2196F3;
+}
+
+.register-btn:hover {
+    background-color: #0b7dda;
+}
+
+.user-info {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+}
+
+.username {
+    font-weight: bold;
+}
+
+.logout-link {
+    color: #ff9999;
+    text-decoration: none;
+}
+
+.logout-link:hover {
+    text-decoration: underline;
+}
+
+#product-forms {
+    padding: 0px 10px;
+    display: flex;
+
+    justify-content: space-between;
+}
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..7ca8a9e
--- /dev/null
+++ b/index.php
@@ -0,0 +1,49 @@
+<?php
+include_once 'database.php';
+
+$request = $_SERVER['REQUEST_URI'];
+$path = parse_url($request, PHP_URL_PATH);
+
+if (isset($_COOKIE["user_id"])) {
+    error_log('cookie is set', 0);
+} else {
+    error_log('cookie is NOT set', 0);
+    $ids = initializeApp(null);
+    setcookie("user_id", $ids["user_id"], time() + 3600, "/");
+    setcookie("db_file", $ids["db_file"], time() + 3600, "/");
+
+    $_COOKIE["user_id"] = $ids["user_id"];
+    $_COOKIE["db_file"] = $ids["db_file"];
+}
+
+/* TODO: remove for prod code */
+$file_path = __DIR__.$request;
+$extension = pathinfo($file_path, PATHINFO_EXTENSION);
+if ($extension === 'css') { 
+    header('Content-Type: text/css');
+    readfile($file_path);
+    exit;
+}
+/* TODO: remove for prod code */
+
+switch($path) {
+    case '': case '/': case '/products':
+        require __DIR__.'/products.php';
+        break;
+    case '/login':
+        require __DIR__.'/login.php';
+        break;
+    case '/register':
+        require __DIR__.'/register.php';
+        break;
+    case '/logout':
+        require __DIR__.'/logout.php';
+        break;
+    case '/orders':
+        require __DIR__.'/orders.php';
+        break;
+    case '/users':
+        require __DIR__.'/users.php';
+        break;
+}
+?>
diff --git a/login.php b/login.php
new file mode 100644
index 0000000..3bfabca
--- /dev/null
+++ b/login.php
@@ -0,0 +1,20 @@
+<?php 
+include_once 'database.php';
+
+session_start();
+
+if ($_SERVER["REQUEST_METHOD"] === "POST") {
+    $email = $_POST["email"];
+    $password = $_POST["password"];
+
+    $username = loginUser($email, $password);
+    if (!is_null($username)) {
+        $_SESSION['error_message'] = null;
+        $_SESSION['username'] = $username;
+        $_SESSION['email'] = $email;
+    } else {
+        $_SESSION['error_message'] = "Invalid email or password";
+    }
+    header("Location: /products");
+}
+?>
diff --git a/logout.php b/logout.php
new file mode 100644
index 0000000..72f4e1b
--- /dev/null
+++ b/logout.php
@@ -0,0 +1,10 @@
+<?php
+session_start();
+/* $personalDb = "db/{$_SESSION["user_id"]}.db"; */ // TODO: put it in cookie
+/* if (file_exists($personalDb)) { */
+/*     unlink($personalDb); */
+/* } */
+session_unset();
+session_destroy();
+header("Location: /products");
+?>
diff --git a/orders.php b/orders.php
new file mode 100644
index 0000000..b5c1125
--- /dev/null
+++ b/orders.php
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Orders - WIP</title>
+    <link rel="stylesheet" href="index.css">
+</head>
+<body>
+<?php include 'header.php'; ?>
+<h1>Orders - Work in progress!</h1>
+</body>
+</html>
diff --git a/products.php b/products.php
new file mode 100644
index 0000000..579a0d0
--- /dev/null
+++ b/products.php
@@ -0,0 +1,73 @@
+<?php
+include_once 'database.php';
+
+$method = $_SERVER['REQUEST_METHOD'];
+if ($method === 'POST') {
+    if (isset($_POST['create'])) {
+        $title = $_POST['title'];
+        $amountInStock = $_POST['in_stock'];
+        createProduct($title, $amountInStock);
+    }
+} elseif ($method === 'GET') {
+    if (isset($_GET["title"])) {
+        $title = $_GET["title"];
+    }
+    if (!is_null($title)) {
+        $products = getProductsByTitle($title);
+    }
+}
+
+if (!isset($products)) {
+    $products = getAllProducts();
+}
+?>
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Products page</title>
+    <link rel="stylesheet" href="index.css">
+</head>
+<body>
+    <?php include 'header.php'; ?>
+    <div id="product-forms">
+        <div id="add-product">
+            <h2>Add new Product</h2>
+            <form method="POST">
+                <label for "title">Title:</label>
+                <input type="text" name="title" required>
+
+                <label for "in_stock">Amount in stock:</label>
+                <input type="text" name="in_stock" required>
+
+                <br>
+                <button type="submit" name="create">Create product</button>
+            </form>
+        </div>
+        <div id="search-product-by-title">
+            <h2>Find product by title</h2>
+            <form method="GET" action="/products">
+                <label for "title">Title:</label>
+                <input type="text" name="title" required>
+
+                <br>
+                <button type="submit">Search</button>
+            </form>
+        </div>
+    </div>
+
+    <h2>Products:</h2>
+    <?php if (empty($products)): ?>
+        <p>No products found.</p>
+    <?php else: ?>
+        <?php foreach ($products as $prod): ?>
+            <div class="product">
+                <h3><?= $prod[1] ?></h3>
+                <p>In stock: <?= $prod[2] ?> items</p>
+                <p><strong>ID: <?= $prod[0] ?></strong></p>
+            </div>
+        <?php endforeach; ?>
+    <?php endif; ?>
+</body>
+</html>
diff --git a/register.php b/register.php
new file mode 100644
index 0000000..2f72712
--- /dev/null
+++ b/register.php
@@ -0,0 +1,21 @@
+<?php
+include_once 'database.php';
+
+session_start();
+
+if ($_SERVER["REQUEST_METHOD"] === "POST") {
+    $username = $_POST["username"];
+    $email = $_POST["email"];
+    $password = $_POST["password"];
+
+    $result = registerUser($username, $email, $password);
+    if ($result) {
+        $_SESSION['error_message'] = null;
+        $_SESSION['username'] = $username;
+        $_SESSION['email'] = $email;
+    } else {
+        $_SESSION['error_message'] = "User with this username already exists!";
+    }
+    header("Location: /products");
+}
+?>
diff --git a/tutorial.php b/tutorial.php
new file mode 100644
index 0000000..435b8b5
--- /dev/null
+++ b/tutorial.php
@@ -0,0 +1,167 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Vulnerability testing</title>
+</head>
+<body>
+    <h1>Welcome to vulnerability testing! Powered by PHP!</h1>
+    <?= 'Hello world!' ?>
+    <?php 
+        // datatypes are inferred at runtime
+        $name = "John";
+        $age = 30;
+        $height = 1.85;
+        $isActive = true;
+        $skills = ["PHP", "JS"];
+        $person = null;
+
+        echo nl2br("\n\n");
+        var_dump($skills);
+    ?>
+ 
+    <?php
+        // type juggling
+        $a = "5";
+        $b = 2;
+
+        $c = $a+$b;
+
+        echo nl2br("\n\ntype juggling:\n");
+        var_dump($c); // whaddaya think? of course, it's int(7)
+    ?>
+
+    <?php
+        if ($age > 18) {
+            echo "Adult";
+        } elseif ($age > 12) {
+            echo "Teenager";
+        } else {
+            echo "Child";
+        }
+        echo nl2br("\n\n");
+
+        switch($day) {
+            case "Monday":
+                echo "Start of week";
+                break;
+            case "Friday":
+                echo "End of week";
+                break;
+            default:
+                echo "Mid-week";
+        }
+        echo nl2br("\n\n");
+
+        for ($i = 0; $i < 5; $i++) {
+            echo $i;
+        }
+        echo nl2br("\n\n");
+
+        $fruits = ["apple", "banana", "orange"];
+
+        foreach($fruits as $fruit) {
+            echo $fruit;
+        }
+        echo nl2br("\n\n");
+
+        foreach($fruits as $index => $fruit) {
+            echo "$index: $fruit";
+        }
+        echo nl2br("\n\n");
+
+        $i = 0;
+        while ($i < 5) {
+            echo $i++;
+        }
+        echo nl2br("\n\n");
+    ?>
+
+    <?php
+        $name = "John";
+        $age = 20;
+
+        echo "Hello, $name! You are $age years old!";
+
+        // for complex, use squirly braces {}
+        /* echo "Hello, {$name}! In 5 years, you'll be {$age + 5} years old."; */ // HACK: doesn't work for some way?
+
+        // NOTE: single quote strings don't interpolate!!!
+        echo nl2br("\n\n");
+    ?>
+
+    <?php
+        function greet($name, $greeting = "Hello") {
+            return "$greeting, $name!";
+        }
+
+        echo greet("John");
+        echo greet("Mary", "Hi");
+
+        $multiply = function($a, $b) {
+            return $a * $b;
+        };
+
+        echo $multiply(3,4);
+        echo nl2br("\n\n");
+    ?>
+
+    <?php
+        class Person {
+            public $name;
+            private $age;
+
+            public function __construct($name, $age) {
+                $this->name = $name;
+                $this->age = $age;
+            }
+
+            public function greet() {
+                return "Hello, my name is {$this->name} and I'm {$this->age} years old.";
+            }
+
+            public function getAge() {
+                return $this->age;
+            }
+        }
+
+        $person = new Person("John", 30);
+        echo $person->greet();
+        echo $person->getAge();
+        echo nl2br("\n\n");
+    ?>
+
+    <?php
+        $fruits = ["apple", "banana", "orange"];
+        echo $fruits[0];
+        echo nl2br("\n");
+
+        $person = [
+            "name" => "John",
+            "age" => 30,
+            "city" => "NewYork"
+        ];
+        echo $person["name"];
+        echo nl2br("\n");
+
+        $users = [
+            ["name" => "John", "age" => 30],
+            ["name" => "Mary", "age" => 25],
+        ];
+        echo $users[1]["name"];
+        echo nl2br("\n");
+
+        $fruits[] = "grape"; // add item to the end
+        $person["job"] = "developer"; // add new K-V pair
+
+        $count = count($fruits);
+        $exists = in_array("apple", $fruits);
+        sort($fruits);
+        $keys = array_keys($person);
+        $values = array_values($person);
+
+        echo nl2br("\n\n");
+    ?>
+</body>
+</html>
diff --git a/users.php b/users.php
new file mode 100644
index 0000000..d53ea16
--- /dev/null
+++ b/users.php
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Users - WIP</title>
+    <link rel="stylesheet" href="index.css">
+</head>
+<body>
+<?php include 'header.php'; ?>
+<h1>Users - Work in progress!</h1>
+</body>
+</html>
diff --git a/utils.php b/utils.php
new file mode 100644
index 0000000..9e75c99
--- /dev/null
+++ b/utils.php
@@ -0,0 +1,15 @@
+<?php
+function generateUUID()
+{
+    // Generate 16 random bytes
+    $data = random_bytes(16);
+
+    // Set version to 0100 (UUID v4)
+    $data[6] = chr(ord($data[6]) & 0x0f | 0x40);
+    // Set bits 6-7 to 10
+    $data[8] = chr(ord($data[8]) & 0x3f | 0x80);
+
+    // Format the UUID
+    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
+}
+?>